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Let's look at an example handshake recorded during a connection to
ws://echo.websocket.org/echo
. Until the handshake completes, a WebSocket session
conforms to the HTTP/1.1 protocol. The client sends the HTTP request shown in Listing 3-1.
Listing 3-1.
HTTP Request from the Client
GET /echo HTTP/1.1
Host:
echo.websocket.org
Origin:
http://www.websocket.org
Sec-WebSocket-Key: 7+C600xYybOv2zmJ69RQsw==
Sec-WebSocket-Version: 13
Upgrade: websocket
Listing 3-2 shows the server sending back the response.
Listing 3-2.
HTTP Response from the Server
101 Switching Protocols
Connection: Upgrade
Date: Wed, 20 Jun 2012 03:39:49 GMT
Sec-WebSocket-Accept: fYoqiH14DgI+5ylEMwM2sOLzOi0=
Server: Kaazing Gateway
Upgrade: WebSocket
Figure
3-6
illustrates the HTTP request upgrade to WebSocket from the client to the
server, also known as the WebSocket opening handshake.
Figure 3-6.
Example of a WebSocket opening handshake
